iommu.h 32.7 KB
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
 * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
 * Author: Joerg Roedel <joerg.roedel@amd.com>
 */

#ifndef __LINUX_IOMMU_H
#define __LINUX_IOMMU_H

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#include <linux/scatterlist.h>
#include <linux/device.h>
#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/of.h>
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#include <linux/ioasid.h>
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#include <uapi/linux/iommu.h>
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#define IOMMU_READ	(1 << 0)
#define IOMMU_WRITE	(1 << 1)
#define IOMMU_CACHE	(1 << 2) /* DMA cache coherency */
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#define IOMMU_NOEXEC	(1 << 3)
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#define IOMMU_MMIO	(1 << 4) /* e.g. things like MSI doorbells */
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/*
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 * Where the bus hardware includes a privilege level as part of its access type
 * markings, and certain devices are capable of issuing transactions marked as
 * either 'supervisor' or 'user', the IOMMU_PRIV flag requests that the other
 * given permission flags only apply to accesses at the higher privilege level,
 * and that unprivileged transactions should have as little access as possible.
 * This would usually imply the same permissions as kernel mappings on the CPU,
 * if the IOMMU page table format is equivalent.
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 */
#define IOMMU_PRIV	(1 << 5)
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struct iommu_ops;
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struct iommu_group;
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struct bus_type;
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struct device;
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struct iommu_domain;
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struct notifier_block;
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struct iommu_sva;
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struct iommu_fault_event;
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/* iommu fault flags */
#define IOMMU_FAULT_READ	0x0
#define IOMMU_FAULT_WRITE	0x1

typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
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			struct device *, unsigned long, int, void *);
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typedef int (*iommu_dev_fault_handler_t)(struct iommu_fault *, void *);
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struct iommu_domain_geometry {
	dma_addr_t aperture_start; /* First address that can be mapped    */
	dma_addr_t aperture_end;   /* Last address that can be mapped     */
	bool force_aperture;       /* DMA only allowed in mappable range? */
};

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/* Domain feature flags */
#define __IOMMU_DOMAIN_PAGING	(1U << 0)  /* Support for iommu_map/unmap */
#define __IOMMU_DOMAIN_DMA_API	(1U << 1)  /* Domain for use in DMA-API
					      implementation              */
#define __IOMMU_DOMAIN_PT	(1U << 2)  /* Domain is identity mapped   */

/*
 * This are the possible domain-types
 *
 *	IOMMU_DOMAIN_BLOCKED	- All DMA is blocked, can be used to isolate
 *				  devices
 *	IOMMU_DOMAIN_IDENTITY	- DMA addresses are system physical addresses
 *	IOMMU_DOMAIN_UNMANAGED	- DMA mappings managed by IOMMU-API user, used
 *				  for VMs
 *	IOMMU_DOMAIN_DMA	- Internally used for DMA-API implementations.
 *				  This flag allows IOMMU drivers to implement
 *				  certain optimizations for these domains
 */
#define IOMMU_DOMAIN_BLOCKED	(0U)
#define IOMMU_DOMAIN_IDENTITY	(__IOMMU_DOMAIN_PT)
#define IOMMU_DOMAIN_UNMANAGED	(__IOMMU_DOMAIN_PAGING)
#define IOMMU_DOMAIN_DMA	(__IOMMU_DOMAIN_PAGING |	\
				 __IOMMU_DOMAIN_DMA_API)

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struct iommu_domain {
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	unsigned type;
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	const struct iommu_ops *ops;
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	unsigned long pgsize_bitmap;	/* Bitmap of page sizes in use */
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	iommu_fault_handler_t handler;
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	void *handler_token;
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	struct iommu_domain_geometry geometry;
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	void *iova_cookie;
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};

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enum iommu_cap {
	IOMMU_CAP_CACHE_COHERENCY,	/* IOMMU can enforce cache coherent DMA
					   transactions */
	IOMMU_CAP_INTR_REMAP,		/* IOMMU supports interrupt isolation */
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	IOMMU_CAP_NOEXEC,		/* IOMMU_NOEXEC flag */
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};
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/*
 * Following constraints are specifc to FSL_PAMUV1:
 *  -aperture must be power of 2, and naturally aligned
 *  -number of windows must be power of 2, and address space size
 *   of each window is determined by aperture size / # of windows
 *  -the actual size of the mapped region of a window must be power
 *   of 2 starting with 4KB and physical address must be naturally
 *   aligned.
 * DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned contraints.
 * The caller can invoke iommu_domain_get_attr to check if the underlying
 * iommu implementation supports these constraints.
 */

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enum iommu_attr {
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	DOMAIN_ATTR_GEOMETRY,
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	DOMAIN_ATTR_PAGING,
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	DOMAIN_ATTR_WINDOWS,
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	DOMAIN_ATTR_FSL_PAMU_STASH,
	DOMAIN_ATTR_FSL_PAMU_ENABLE,
	DOMAIN_ATTR_FSL_PAMUV1,
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	DOMAIN_ATTR_NESTING,	/* two stages of translation */
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	DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE,
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	DOMAIN_ATTR_IO_PGTABLE_CFG,
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	DOMAIN_ATTR_MAX,
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};

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/* These are the possible reserved region types */
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enum iommu_resv_type {
	/* Memory regions which must be mapped 1:1 at all times */
	IOMMU_RESV_DIRECT,
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	/*
	 * Memory regions which are advertised to be 1:1 but are
	 * commonly considered relaxable in some conditions,
	 * for instance in device assignment use case (USB, Graphics)
	 */
	IOMMU_RESV_DIRECT_RELAXABLE,
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	/* Arbitrary "never map this or give it to a device" address ranges */
	IOMMU_RESV_RESERVED,
	/* Hardware MSI region (untranslated) */
	IOMMU_RESV_MSI,
	/* Software-managed MSI translation window */
	IOMMU_RESV_SW_MSI,
};
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/**
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 * struct iommu_resv_region - descriptor for a reserved memory region
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 * @list: Linked list pointers
 * @start: System physical start address of the region
 * @length: Length of the region in bytes
 * @prot: IOMMU Protection flags (READ/WRITE/...)
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 * @type: Type of the reserved region
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 */
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struct iommu_resv_region {
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	struct list_head	list;
	phys_addr_t		start;
	size_t			length;
	int			prot;
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	enum iommu_resv_type	type;
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};

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/* Per device IOMMU features */
enum iommu_dev_features {
	IOMMU_DEV_FEAT_AUX,	/* Aux-domain feature */
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	IOMMU_DEV_FEAT_SVA,	/* Shared Virtual Addresses */
};

#define IOMMU_PASID_INVALID	(-1U)

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#ifdef CONFIG_IOMMU_API

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/**
 * struct iommu_iotlb_gather - Range information for a pending IOTLB flush
 *
 * @start: IOVA representing the start of the range to be flushed
 * @end: IOVA representing the end of the range to be flushed (exclusive)
 * @pgsize: The interval at which to perform the flush
 *
 * This structure is intended to be updated by multiple calls to the
 * ->unmap() function in struct iommu_ops before eventually being passed
 * into ->iotlb_sync().
 */
struct iommu_iotlb_gather {
	unsigned long		start;
	unsigned long		end;
	size_t			pgsize;
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	struct page		*freelist;
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};

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/**
 * struct iommu_ops - iommu ops and capabilities
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 * @capable: check capability
 * @domain_alloc: allocate iommu domain
 * @domain_free: free iommu domain
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 * @attach_dev: attach device to an iommu domain
 * @detach_dev: detach device from an iommu domain
 * @map: map a physically contiguous memory region to an iommu domain
 * @unmap: unmap a physically contiguous memory region from an iommu domain
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 * @flush_iotlb_all: Synchronously flush all hardware TLBs for this domain
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 * @iotlb_sync_map: Sync mappings created recently using @map to the hardware
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 * @iotlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
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 *            queue
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 * @iova_to_phys: translate iova to physical address
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 * @probe_device: Add device to iommu driver handling
 * @release_device: Remove device from iommu driver handling
 * @probe_finalize: Do final setup work after the device is added to an IOMMU
 *                  group and attached to the groups domain
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 * @device_group: find iommu group for a particular device
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 * @domain_get_attr: Query domain attributes
 * @domain_set_attr: Change domain attributes
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 * @get_resv_regions: Request list of reserved regions for a device
 * @put_resv_regions: Free list of reserved regions for a device
 * @apply_resv_region: Temporary helper call-back for iova reserved ranges
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 * @domain_window_enable: Configure and enable a particular window for a domain
 * @domain_window_disable: Disable a particular window for a domain
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 * @of_xlate: add OF master IDs to iommu grouping
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 * @is_attach_deferred: Check if domain attach should be deferred from iommu
 *                      driver init to device driver init (default no)
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 * @dev_has/enable/disable_feat: per device entries to check/enable/disable
 *                               iommu specific features.
 * @dev_feat_enabled: check enabled feature
 * @aux_attach/detach_dev: aux-domain specific attach/detach entries.
 * @aux_get_pasid: get the pasid given an aux-domain
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 * @sva_bind: Bind process address space to device
 * @sva_unbind: Unbind process address space from device
 * @sva_get_pasid: Get PASID associated to a SVA handle
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 * @page_response: handle page request response
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 * @cache_invalidate: invalidate translation caches
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 * @sva_bind_gpasid: bind guest pasid and mm
 * @sva_unbind_gpasid: unbind guest pasid and mm
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 * @def_domain_type: device default domain type, return value:
 *		- IOMMU_DOMAIN_IDENTITY: must use an identity domain
 *		- IOMMU_DOMAIN_DMA: must use a dma domain
 *		- 0: use the default setting
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 * @pgsize_bitmap: bitmap of all possible supported page sizes
 * @owner: Driver module providing these ops
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 */
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struct iommu_ops {
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	bool (*capable)(enum iommu_cap);
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	/* Domain allocation and freeing by the iommu driver */
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	struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
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	void (*domain_free)(struct iommu_domain *);

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	int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
	void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
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	int (*map)(struct iommu_domain *domain, unsigned long iova,
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		   phys_addr_t paddr, size_t size, int prot, gfp_t gfp);
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	size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
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		     size_t size, struct iommu_iotlb_gather *iotlb_gather);
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	void (*flush_iotlb_all)(struct iommu_domain *domain);
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	void (*iotlb_sync_map)(struct iommu_domain *domain);
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	void (*iotlb_sync)(struct iommu_domain *domain,
			   struct iommu_iotlb_gather *iotlb_gather);
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	phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
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	struct iommu_device *(*probe_device)(struct device *dev);
	void (*release_device)(struct device *dev);
	void (*probe_finalize)(struct device *dev);
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	struct iommu_group *(*device_group)(struct device *dev);
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	int (*domain_get_attr)(struct iommu_domain *domain,
			       enum iommu_attr attr, void *data);
	int (*domain_set_attr)(struct iommu_domain *domain,
			       enum iommu_attr attr, void *data);
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	/* Request/Free a list of reserved regions for a device */
	void (*get_resv_regions)(struct device *dev, struct list_head *list);
	void (*put_resv_regions)(struct device *dev, struct list_head *list);
	void (*apply_resv_region)(struct device *dev,
				  struct iommu_domain *domain,
				  struct iommu_resv_region *region);
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	/* Window handling functions */
	int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
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				    phys_addr_t paddr, u64 size, int prot);
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	void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);

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	int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
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	bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev);
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	/* Per device IOMMU features */
	bool (*dev_has_feat)(struct device *dev, enum iommu_dev_features f);
	bool (*dev_feat_enabled)(struct device *dev, enum iommu_dev_features f);
	int (*dev_enable_feat)(struct device *dev, enum iommu_dev_features f);
	int (*dev_disable_feat)(struct device *dev, enum iommu_dev_features f);

	/* Aux-domain specific attach/detach entries */
	int (*aux_attach_dev)(struct iommu_domain *domain, struct device *dev);
	void (*aux_detach_dev)(struct iommu_domain *domain, struct device *dev);
	int (*aux_get_pasid)(struct iommu_domain *domain, struct device *dev);

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	struct iommu_sva *(*sva_bind)(struct device *dev, struct mm_struct *mm,
				      void *drvdata);
	void (*sva_unbind)(struct iommu_sva *handle);
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	u32 (*sva_get_pasid)(struct iommu_sva *handle);
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	int (*page_response)(struct device *dev,
			     struct iommu_fault_event *evt,
			     struct iommu_page_response *msg);
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	int (*cache_invalidate)(struct iommu_domain *domain, struct device *dev,
				struct iommu_cache_invalidate_info *inv_info);
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	int (*sva_bind_gpasid)(struct iommu_domain *domain,
			struct device *dev, struct iommu_gpasid_bind_data *data);

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	int (*sva_unbind_gpasid)(struct device *dev, u32 pasid);
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	int (*def_domain_type)(struct device *dev);

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	unsigned long pgsize_bitmap;
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	struct module *owner;
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};

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/**
 * struct iommu_device - IOMMU core representation of one IOMMU hardware
 *			 instance
 * @list: Used by the iommu-core to keep a list of registered iommus
 * @ops: iommu-ops for talking to this iommu
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 * @dev: struct device for sysfs handling
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 */
struct iommu_device {
	struct list_head list;
	const struct iommu_ops *ops;
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	struct fwnode_handle *fwnode;
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	struct device *dev;
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};

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/**
 * struct iommu_fault_event - Generic fault event
 *
 * Can represent recoverable faults such as a page requests or
 * unrecoverable faults such as DMA or IRQ remapping faults.
 *
 * @fault: fault descriptor
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 * @list: pending fault event list, used for tracking responses
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 */
struct iommu_fault_event {
	struct iommu_fault fault;
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	struct list_head list;
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};

/**
 * struct iommu_fault_param - per-device IOMMU fault data
 * @handler: Callback function to handle IOMMU faults at device level
 * @data: handler private data
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 * @faults: holds the pending faults which needs response
 * @lock: protect pending faults list
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 */
struct iommu_fault_param {
	iommu_dev_fault_handler_t handler;
	void *data;
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	struct list_head faults;
	struct mutex lock;
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};

/**
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 * struct dev_iommu - Collection of per-device IOMMU data
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 *
 * @fault_param: IOMMU detected device fault reporting data
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 * @fwspec:	 IOMMU fwspec data
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 * @iommu_dev:	 IOMMU device this device is linked to
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 * @priv:	 IOMMU Driver private data
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 *
 * TODO: migrate other per device data pointers under iommu_dev_data, e.g.
 *	struct iommu_group	*iommu_group;
 */
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struct dev_iommu {
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	struct mutex lock;
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	struct iommu_fault_param	*fault_param;
	struct iommu_fwspec		*fwspec;
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	struct iommu_device		*iommu_dev;
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	void				*priv;
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};

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int  iommu_device_register(struct iommu_device *iommu);
void iommu_device_unregister(struct iommu_device *iommu);
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int  iommu_device_sysfs_add(struct iommu_device *iommu,
			    struct device *parent,
			    const struct attribute_group **groups,
			    const char *fmt, ...) __printf(4, 5);
void iommu_device_sysfs_remove(struct iommu_device *iommu);
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int  iommu_device_link(struct iommu_device   *iommu, struct device *link);
void iommu_device_unlink(struct iommu_device *iommu, struct device *link);
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int iommu_deferred_attach(struct device *dev, struct iommu_domain *domain);
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static inline void __iommu_device_set_ops(struct iommu_device *iommu,
					  const struct iommu_ops *ops)
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{
	iommu->ops = ops;
}

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#define iommu_device_set_ops(iommu, ops)				\
do {									\
	struct iommu_ops *__ops = (struct iommu_ops *)(ops);		\
	__ops->owner = THIS_MODULE;					\
	__iommu_device_set_ops(iommu, __ops);				\
} while (0)

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static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
					   struct fwnode_handle *fwnode)
{
	iommu->fwnode = fwnode;
}

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static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
{
	return (struct iommu_device *)dev_get_drvdata(dev);
}

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static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
{
	*gather = (struct iommu_iotlb_gather) {
		.start	= ULONG_MAX,
	};
}

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#define IOMMU_GROUP_NOTIFY_ADD_DEVICE		1 /* Device added */
#define IOMMU_GROUP_NOTIFY_DEL_DEVICE		2 /* Pre Device removed */
#define IOMMU_GROUP_NOTIFY_BIND_DRIVER		3 /* Pre Driver bind */
#define IOMMU_GROUP_NOTIFY_BOUND_DRIVER		4 /* Post Driver bind */
#define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER	5 /* Pre Driver unbind */
#define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER	6 /* Post Driver unbind */

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extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
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extern int bus_iommu_probe(struct bus_type *bus);
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extern bool iommu_present(struct bus_type *bus);
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extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
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extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
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extern struct iommu_group *iommu_group_get_by_id(int id);
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extern void iommu_domain_free(struct iommu_domain *domain);
extern int iommu_attach_device(struct iommu_domain *domain,
			       struct device *dev);
extern void iommu_detach_device(struct iommu_domain *domain,
				struct device *dev);
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extern int iommu_uapi_cache_invalidate(struct iommu_domain *domain,
				       struct device *dev,
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				       void __user *uinfo);

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extern int iommu_uapi_sva_bind_gpasid(struct iommu_domain *domain,
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				      struct device *dev, void __user *udata);
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extern int iommu_uapi_sva_unbind_gpasid(struct iommu_domain *domain,
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					struct device *dev, void __user *udata);
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extern int iommu_sva_unbind_gpasid(struct iommu_domain *domain,
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				   struct device *dev, ioasid_t pasid);
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extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev);
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extern struct iommu_domain *iommu_get_dma_domain(struct device *dev);
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extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
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		     phys_addr_t paddr, size_t size, int prot);
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extern int iommu_map_atomic(struct iommu_domain *domain, unsigned long iova,
			    phys_addr_t paddr, size_t size, int prot);
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extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
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			  size_t size);
extern size_t iommu_unmap_fast(struct iommu_domain *domain,
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			       unsigned long iova, size_t size,
			       struct iommu_iotlb_gather *iotlb_gather);
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extern size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
			   struct scatterlist *sg,unsigned int nents, int prot);
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extern size_t iommu_map_sg_atomic(struct iommu_domain *domain,
				  unsigned long iova, struct scatterlist *sg,
				  unsigned int nents, int prot);
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extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
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extern void iommu_set_fault_handler(struct iommu_domain *domain,
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			iommu_fault_handler_t handler, void *token);
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extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
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extern void generic_iommu_put_resv_regions(struct device *dev,
					   struct list_head *list);
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extern void iommu_set_default_passthrough(bool cmd_line);
extern void iommu_set_default_translated(bool cmd_line);
extern bool iommu_default_passthrough(void);
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extern struct iommu_resv_region *
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iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
			enum iommu_resv_type type);
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extern int iommu_get_group_resv_regions(struct iommu_group *group,
					struct list_head *head);
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extern int iommu_attach_group(struct iommu_domain *domain,
			      struct iommu_group *group);
extern void iommu_detach_group(struct iommu_domain *domain,
			       struct iommu_group *group);
extern struct iommu_group *iommu_group_alloc(void);
extern void *iommu_group_get_iommudata(struct iommu_group *group);
extern void iommu_group_set_iommudata(struct iommu_group *group,
				      void *iommu_data,
				      void (*release)(void *iommu_data));
extern int iommu_group_set_name(struct iommu_group *group, const char *name);
extern int iommu_group_add_device(struct iommu_group *group,
				  struct device *dev);
extern void iommu_group_remove_device(struct device *dev);
extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
				    int (*fn)(struct device *, void *));
extern struct iommu_group *iommu_group_get(struct device *dev);
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extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
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extern void iommu_group_put(struct iommu_group *group);
extern int iommu_group_register_notifier(struct iommu_group *group,
					 struct notifier_block *nb);
extern int iommu_group_unregister_notifier(struct iommu_group *group,
					   struct notifier_block *nb);
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extern int iommu_register_device_fault_handler(struct device *dev,
					iommu_dev_fault_handler_t handler,
					void *data);

extern int iommu_unregister_device_fault_handler(struct device *dev);

extern int iommu_report_device_fault(struct device *dev,
				     struct iommu_fault_event *evt);
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extern int iommu_page_response(struct device *dev,
			       struct iommu_page_response *msg);
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extern int iommu_group_id(struct iommu_group *group);
507
extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
508

509 510 511 512
extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
				 void *data);
extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
				 void *data);
513

514 515
/* Window handling function prototypes */
extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
516 517
				      phys_addr_t offset, u64 size,
				      int prot);
518 519 520

extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
			      unsigned long iova, int flags);
521

522
static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
523 524 525 526 527
{
	if (domain->ops->flush_iotlb_all)
		domain->ops->flush_iotlb_all(domain);
}

528
static inline void iommu_iotlb_sync(struct iommu_domain *domain,
529
				  struct iommu_iotlb_gather *iotlb_gather)
530 531
{
	if (domain->ops->iotlb_sync)
532
		domain->ops->iotlb_sync(domain, iotlb_gather);
533 534

	iommu_iotlb_gather_init(iotlb_gather);
535 536
}

537 538 539 540 541 542 543 544 545 546 547 548 549 550
static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
					       struct iommu_iotlb_gather *gather,
					       unsigned long iova, size_t size)
{
	unsigned long start = iova, end = start + size;

	/*
	 * If the new page is disjoint from the current range or is mapped at
	 * a different granularity, then sync the TLB so that the gather
	 * structure can be rewritten.
	 */
	if (gather->pgsize != size ||
	    end < gather->start || start > gather->end) {
		if (gather->pgsize)
551
			iommu_iotlb_sync(domain, gather);
552 553 554 555 556 557 558 559 560 561
		gather->pgsize = size;
	}

	if (gather->end < end)
		gather->end = end;

	if (gather->start > start)
		gather->start = start;
}

562 563
/* PCI device grouping function */
extern struct iommu_group *pci_device_group(struct device *dev);
564 565
/* Generic device grouping function */
extern struct iommu_group *generic_device_group(struct device *dev);
566 567
/* FSL-MC device grouping function */
struct iommu_group *fsl_mc_device_group(struct device *dev);
568

569 570 571 572 573
/**
 * struct iommu_fwspec - per-device IOMMU instance data
 * @ops: ops for this device's IOMMU
 * @iommu_fwnode: firmware handle for this device's IOMMU
 * @iommu_priv: IOMMU driver private data for this device
574
 * @num_pasid_bits: number of PASID bits supported by this device
575 576 577 578 579 580
 * @num_ids: number of associated device IDs
 * @ids: IDs which this device may present to the IOMMU
 */
struct iommu_fwspec {
	const struct iommu_ops	*ops;
	struct fwnode_handle	*iommu_fwnode;
581
	u32			flags;
582
	u32			num_pasid_bits;
583
	unsigned int		num_ids;
584
	u32			ids[];
585 586
};

587 588 589
/* ATS is supported */
#define IOMMU_FWSPEC_PCI_RC_ATS			(1 << 0)

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/**
 * struct iommu_sva - handle to a device-mm bond
 */
struct iommu_sva {
	struct device			*dev;
};

597 598 599 600
int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
		      const struct iommu_ops *ops);
void iommu_fwspec_free(struct device *dev);
int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
601
const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
602

603 604
static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
{
605 606 607 608
	if (dev->iommu)
		return dev->iommu->fwspec;
	else
		return NULL;
609 610 611 612 613
}

static inline void dev_iommu_fwspec_set(struct device *dev,
					struct iommu_fwspec *fwspec)
{
614
	dev->iommu->fwspec = fwspec;
615 616
}

617 618
static inline void *dev_iommu_priv_get(struct device *dev)
{
619
	return dev->iommu->priv;
620 621 622 623
}

static inline void dev_iommu_priv_set(struct device *dev, void *priv)
{
624
	dev->iommu->priv = priv;
625 626
}

627 628 629
int iommu_probe_device(struct device *dev);
void iommu_release_device(struct device *dev);

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int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features f);
int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features f);
bool iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features f);
int iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev);
void iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev);
int iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev);

637 638 639 640
struct iommu_sva *iommu_sva_bind_device(struct device *dev,
					struct mm_struct *mm,
					void *drvdata);
void iommu_sva_unbind_device(struct iommu_sva *handle);
641
u32 iommu_sva_get_pasid(struct iommu_sva *handle);
642

643 644
#else /* CONFIG_IOMMU_API */

645
struct iommu_ops {};
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struct iommu_group {};
647
struct iommu_fwspec {};
648
struct iommu_device {};
649
struct iommu_fault_param {};
650
struct iommu_iotlb_gather {};
651

652
static inline bool iommu_present(struct bus_type *bus)
653 654 655 656
{
	return false;
}

657 658 659 660 661
static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
{
	return false;
}

662
static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
663 664 665 666
{
	return NULL;
}

667 668 669 670 671
static inline struct iommu_group *iommu_group_get_by_id(int id)
{
	return NULL;
}

672 673 674 675 676 677 678 679 680 681 682 683 684 685 686
static inline void iommu_domain_free(struct iommu_domain *domain)
{
}

static inline int iommu_attach_device(struct iommu_domain *domain,
				      struct device *dev)
{
	return -ENODEV;
}

static inline void iommu_detach_device(struct iommu_domain *domain,
				       struct device *dev)
{
}

687 688 689 690 691
static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
{
	return NULL;
}

692
static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
693
			    phys_addr_t paddr, size_t size, int prot)
694 695 696 697
{
	return -ENODEV;
}

698 699 700 701 702 703 704
static inline int iommu_map_atomic(struct iommu_domain *domain,
				   unsigned long iova, phys_addr_t paddr,
				   size_t size, int prot)
{
	return -ENODEV;
}

705 706
static inline size_t iommu_unmap(struct iommu_domain *domain,
				 unsigned long iova, size_t size)
707
{
708
	return 0;
709 710
}

711
static inline size_t iommu_unmap_fast(struct iommu_domain *domain,
712 713
				      unsigned long iova, int gfp_order,
				      struct iommu_iotlb_gather *iotlb_gather)
714
{
715
	return 0;
716 717
}

718 719 720 721
static inline size_t iommu_map_sg(struct iommu_domain *domain,
				  unsigned long iova, struct scatterlist *sg,
				  unsigned int nents, int prot)
{
722
	return 0;
723 724
}

725 726 727 728 729 730 731
static inline size_t iommu_map_sg_atomic(struct iommu_domain *domain,
				  unsigned long iova, struct scatterlist *sg,
				  unsigned int nents, int prot)
{
	return 0;
}

732
static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
733 734 735
{
}

736
static inline void iommu_iotlb_sync(struct iommu_domain *domain,
737
				  struct iommu_iotlb_gather *iotlb_gather)
738 739 740
{
}

741 742
static inline int iommu_domain_window_enable(struct iommu_domain *domain,
					     u32 wnd_nr, phys_addr_t paddr,
743
					     u64 size, int prot)
744 745 746 747
{
	return -ENODEV;
}

748
static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
749 750 751 752
{
	return 0;
}

753
static inline void iommu_set_fault_handler(struct iommu_domain *domain,
754
				iommu_fault_handler_t handler, void *token)
755 756 757
{
}

758
static inline void iommu_get_resv_regions(struct device *dev,
759 760 761 762
					struct list_head *list)
{
}

763
static inline void iommu_put_resv_regions(struct device *dev,
764 765 766 767
					struct list_head *list)
{
}

768 769 770 771 772 773
static inline int iommu_get_group_resv_regions(struct iommu_group *group,
					       struct list_head *head)
{
	return -ENODEV;
}

774 775 776 777 778 779 780 781 782 783 784 785 786
static inline void iommu_set_default_passthrough(bool cmd_line)
{
}

static inline void iommu_set_default_translated(bool cmd_line)
{
}

static inline bool iommu_default_passthrough(void)
{
	return true;
}

787 788
static inline int iommu_attach_group(struct iommu_domain *domain,
				     struct iommu_group *group)
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{
	return -ENODEV;
}

793 794
static inline void iommu_detach_group(struct iommu_domain *domain,
				      struct iommu_group *group)
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795 796 797
{
}

798
static inline struct iommu_group *iommu_group_alloc(void)
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{
	return ERR_PTR(-ENODEV);
}

803
static inline void *iommu_group_get_iommudata(struct iommu_group *group)
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{
	return NULL;
}

808 809 810
static inline void iommu_group_set_iommudata(struct iommu_group *group,
					     void *iommu_data,
					     void (*release)(void *iommu_data))
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{
}

814 815
static inline int iommu_group_set_name(struct iommu_group *group,
				       const char *name)
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{
	return -ENODEV;
}

820 821
static inline int iommu_group_add_device(struct iommu_group *group,
					 struct device *dev)
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822 823 824 825
{
	return -ENODEV;
}

826
static inline void iommu_group_remove_device(struct device *dev)
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827 828 829
{
}

830 831 832
static inline int iommu_group_for_each_dev(struct iommu_group *group,
					   void *data,
					   int (*fn)(struct device *, void *))
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Alex Williamson 已提交
833 834 835 836
{
	return -ENODEV;
}

837
static inline struct iommu_group *iommu_group_get(struct device *dev)
A
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838 839 840 841
{
	return NULL;
}

842
static inline void iommu_group_put(struct iommu_group *group)
A
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843 844 845
{
}

846 847
static inline int iommu_group_register_notifier(struct iommu_group *group,
						struct notifier_block *nb)
848 849 850 851
{
	return -ENODEV;
}

852 853
static inline int iommu_group_unregister_notifier(struct iommu_group *group,
						  struct notifier_block *nb)
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854 855 856 857
{
	return 0;
}

858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876
static inline
int iommu_register_device_fault_handler(struct device *dev,
					iommu_dev_fault_handler_t handler,
					void *data)
{
	return -ENODEV;
}

static inline int iommu_unregister_device_fault_handler(struct device *dev)
{
	return 0;
}

static inline
int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt)
{
	return -ENODEV;
}

877 878 879 880 881 882
static inline int iommu_page_response(struct device *dev,
				      struct iommu_page_response *msg)
{
	return -ENODEV;
}

883
static inline int iommu_group_id(struct iommu_group *group)
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884 885 886
{
	return -ENODEV;
}
887

888 889 890 891 892 893 894 895 896 897 898 899
static inline int iommu_domain_get_attr(struct iommu_domain *domain,
					enum iommu_attr attr, void *data)
{
	return -EINVAL;
}

static inline int iommu_domain_set_attr(struct iommu_domain *domain,
					enum iommu_attr attr, void *data)
{
	return -EINVAL;
}

900
static inline int  iommu_device_register(struct iommu_device *iommu)
901
{
902
	return -ENODEV;
903 904
}

905 906
static inline void iommu_device_set_ops(struct iommu_device *iommu,
					const struct iommu_ops *ops)
907 908 909
{
}

910 911
static inline void iommu_device_set_fwnode(struct iommu_device *iommu,
					   struct fwnode_handle *fwnode)
912 913 914
{
}

915 916 917 918 919
static inline struct iommu_device *dev_to_iommu_device(struct device *dev)
{
	return NULL;
}

920 921 922 923
static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
{
}

924 925 926 927 928 929
static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
					       struct iommu_iotlb_gather *gather,
					       unsigned long iova, size_t size)
{
}

930
static inline void iommu_device_unregister(struct iommu_device *iommu)
931 932 933
{
}

934 935 936 937
static inline int  iommu_device_sysfs_add(struct iommu_device *iommu,
					  struct device *parent,
					  const struct attribute_group **groups,
					  const char *fmt, ...)
938
{
939
	return -ENODEV;
940 941
}

942
static inline void iommu_device_sysfs_remove(struct iommu_device *iommu)
943 944 945
{
}

946
static inline int iommu_device_link(struct device *dev, struct device *link)
947 948 949 950
{
	return -EINVAL;
}

951
static inline void iommu_device_unlink(struct device *dev, struct device *link)
952 953 954
{
}

955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971
static inline int iommu_fwspec_init(struct device *dev,
				    struct fwnode_handle *iommu_fwnode,
				    const struct iommu_ops *ops)
{
	return -ENODEV;
}

static inline void iommu_fwspec_free(struct device *dev)
{
}

static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
				       int num_ids)
{
	return -ENODEV;
}

972
static inline
973
const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
974 975 976 977
{
	return NULL;
}

978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012
static inline bool
iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features feat)
{
	return false;
}

static inline int
iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
{
	return -ENODEV;
}

static inline int
iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat)
{
	return -ENODEV;
}

static inline int
iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev)
{
	return -ENODEV;
}

static inline void
iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev)
{
}

static inline int
iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev)
{
	return -ENODEV;
}

1013 1014 1015 1016 1017 1018 1019 1020 1021 1022
static inline struct iommu_sva *
iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata)
{
	return NULL;
}

static inline void iommu_sva_unbind_device(struct iommu_sva *handle)
{
}

1023
static inline u32 iommu_sva_get_pasid(struct iommu_sva *handle)
1024 1025 1026 1027
{
	return IOMMU_PASID_INVALID;
}

1028
static inline int
1029 1030 1031
iommu_uapi_cache_invalidate(struct iommu_domain *domain,
			    struct device *dev,
			    struct iommu_cache_invalidate_info *inv_info)
1032 1033 1034
{
	return -ENODEV;
}
1035 1036

static inline int iommu_uapi_sva_bind_gpasid(struct iommu_domain *domain,
1037
					     struct device *dev, void __user *udata)
1038 1039 1040 1041
{
	return -ENODEV;
}

1042
static inline int iommu_uapi_sva_unbind_gpasid(struct iommu_domain *domain,
1043
					       struct device *dev, void __user *udata)
1044 1045 1046 1047 1048
{
	return -ENODEV;
}

static inline int iommu_sva_unbind_gpasid(struct iommu_domain *domain,
1049 1050
					  struct device *dev,
					  ioasid_t pasid)
1051 1052 1053
{
	return -ENODEV;
}
1054

1055 1056 1057 1058
static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
{
	return NULL;
}
1059 1060
#endif /* CONFIG_IOMMU_API */

1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076
/**
 * iommu_map_sgtable - Map the given buffer to the IOMMU domain
 * @domain:	The IOMMU domain to perform the mapping
 * @iova:	The start address to map the buffer
 * @sgt:	The sg_table object describing the buffer
 * @prot:	IOMMU protection bits
 *
 * Creates a mapping at @iova for the buffer described by a scatterlist
 * stored in the given sg_table object in the provided IOMMU domain.
 */
static inline size_t iommu_map_sgtable(struct iommu_domain *domain,
			unsigned long iova, struct sg_table *sgt, int prot)
{
	return iommu_map_sg(domain, iova, sgt->sgl, sgt->orig_nents, prot);
}

1077 1078 1079 1080 1081 1082 1083
#ifdef CONFIG_IOMMU_DEBUGFS
extern	struct dentry *iommu_debugfs_dir;
void iommu_debugfs_setup(void);
#else
static inline void iommu_debugfs_setup(void) {}
#endif

1084
#endif /* __LINUX_IOMMU_H */
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